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✔ Meets/Exceeds: ISO7380 ✔ Material of Screws: alloy steel, 10.9 grade tensile strength, hardness: HRC 32-39 ✔ Rust proof of screws: black oxide finish and anti-rust oil covering ✔ Material of hex wrench: chrome-vanadium steel, nickel plated to anti-rust ✔ Easy to Store: These screws Come in an easy-use storage case Item---------Thread Length------Total Length M3 x 6---------6mm/0.24"--------7.6mm/0.30" M3 x 8---------8mm/0.31"--------9.6mm/0.38" M3 x 10-------10mm/0.39"-------11.6mm/0.46" M3 x 12-------12mm/0.47"-------13.6mm/0.54" M3 x 16-------16mm/0.63"-------17.6mm/0.69" Package Contains: M3 x 6------------50 Pcs M3 x 8------------50 Pcs M3 x 10-----------50 Pcs M3 x 12-----------50 Pcs M3 x 16-----------50 Pcs Hex Wrench--1 Pcs Total : 251 Pcs About Hex Socket Drives Hex Socket drives, also known as Internal Hex drives, have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen wrench About Button Head Button head is similar to standard pan head screws but have a curved top